<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>demo</title>
  <script type="text/javascript" src="../vue.js"></script>
</head>

<body>
  <div id="demo">
    <h2>人员列表</h2>
    <input type="text" v-model="keyWord">
    <ul>
        <li v-for="p in persons2" :key="p.id">
            {{p.name}} - {{p.age}} - {{p.gender}}
        </li>
    </ul>
</div>
</body>
<script type="text/javascript">
  new Vue({
    el: '#demo',
    data: {
      keyWord: '',
      persons: [
        { id: '001', name: '马冬梅', age: 19, gender: '女' },
        { id: '002', name: '周冬雨', age: 20, gender: '女' },
        { id: '003', name: '周杰伦', age: 21, gender: '男' },
        { id: '004', name: '帅邓伦', age: 22, gender: '男' },
      ],
      persons2: []
    },
    watch: {
      keyWord: {
        immediate: true,
        handler(val) {
          const fltPersons = this.persons.filter((person) => {
            return person.name.indexOf(val) !== -1
          })
          console.log(fltPersons)
          this.persons2 = fltPersons
        }
      }
    }
  })
</script>

</html>